At a recent event to celebrate the 100th episode of this ABC Family smash, we caught up with actress Sasha Pieterse, whose full-time return on Pretty Little Liars Season 5 will be the early focus of upcoming summer episodes.

What can fans expect from the "natural disaster" of Alison? What will her relationship be like with Hanna? With Emily? And is she truly a villain? Or just misunderstood?